Upgrade opensuse 42.3 to 15.0

openSUSE Leap 15 is based on SUSE Linux Enterprise (SLE).
The name “Leap 15” is meant to match the SUSE Linux Enterprise Version it is based off of.
(SUSE Linux Enterprise 15) Leap 15 uses Linux Kernel 4.12 LTS.
This guide was written during a upgrade from 42.3 to 15.0 and worked like a charm.

Try it out and bring you systems to a new level.

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sed-i's/42.3/15.0/'/etc/zypp/repos.d/*

sed -i 's/42.3/15.0/' /etc/zypp/repos.d/*

Load new repositories:

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zypper refresh

zypper refresh

Now you can start the upgrade procedure:

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zypper dup

zypper dup

Slow internet connection or in hurry? – download all packages first and continue the upgrade later: